Perhaps you should try some spelling variations:
nhanh luong » nhanh chuong, nang luong, nhanh chong
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong van » cong vang, cong san, song van
ban cau » bang cau, van cau, ban dau
ban can » ban dan, ban hang, ban hanh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - ((nhanh luong) or (nhanh quang)) cua dung cong van ((ban cau) OR (ban can))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - ((nhanh luong) OR (nhanh quang)) cua dung cong van ((ban cau) OR (ban can)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - ((nhanh luong) or (nhanh quang)) cua dung cong van ((ban cau) OR (ban can))".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - ((nhanh luong) or (nhanh quang)) cua dung cong van ((ban cau) OR (ban can))*.